Mesoscale modulation of air-sea CO2 flux in Drake Passage

Details

• Journal Title:
  Journal of Geophysical Research: Oceans
• Personal Author:
  Song, Hajoon ; Marshall, John ; Munro, David R. ; Dutkiewicz, Stephanie ; Sweeney, Colm ; McGillicuddy, D. J. ; Hausmann, Ute
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)
• Description:
  We investigate the role of mesoscale eddies in modulating air-sea CO2 flux and associated biogeochemical fields in Drake Passage using in situ observations and an eddy-resolving numerical model. Both observations and model show a negative correlation between temperature and partial pressure of CO2 (pCO(2)) anomalies at the sea surface in austral summer, indicating that warm/cold anticyclonic/cyclonic eddies take up more/less CO2. In austral winter, in contrast, relationships are reversed: warm/cold anticyclonic/cyclonic eddies are characterized by a positive/negative pCO(2) anomaly and more/less CO2 outgassing. It is argued that DIC-driven effects on pCO(2) are greater than temperature effects in austral summer, leading to a negative correlation. In austral winter, however, the reverse is true. An eddy-centric analysis of the model solution reveals that nitrate and iron respond differently to the same vertical mixing: vertical mixing has a greater impact on iron because its normalized vertical gradient at the base of the surface mixed layer is an order of magnitude greater than that of nitrate.
• Source:
  Journal of Geophysical Research-Oceans, 121(9), 6635-6649.
• DOI:
  https://doi.org/10.1002/2016jc011714
• Document Type:
  Journal Article
• Funding:
  Grant no. NA12OAR4310058
• Rights Information:
  Other
• Compliance:
  Submitted
• Download URL:
  https://repository.library.noaa.gov/view/noaa/18319/noaa_18319_DS1.pdf
• File Type:
  [PDF - 4.06 MB]
• Collection(s):
  Office of Oceanic and Atmospheric Research (OAR) ; NOAA Cooperative Institutes
• Main Document Checksum:
  urn:sha256:74ecb77b5092436f1293dddf61303ac1e63e24e845eebba0b3c0008fefc9f79b